Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58545a011b8437330653be28eeb503d8919ec5247569503af4f4880e2361e18' 
  AND token = 'nSL4lYoHsDdlpFv2Q37ui78LOQKnZYEtiF82dxgK1bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}